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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93018923186a5fb83e037b053256ce9dc47e3e662310999b658f8e34c6dbe332' 
  AND token = 'sq7L3/quNCLxtMHDCDUl0Gf8CwKza/wXX99LUIhoJwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}